package Mouse;

/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002. All rights
 * reserved. Software written by Ian F. Darwin and others. $Id: LICENSE,v 1.8
 * 2004/02/09 03:33:38 ian Exp $ Redistribution and use in source and binary
 * forms, with or without modification, are permitted provided that the
 * following conditions are met: 1. Redistributions of source code must retain
 * the above copyright notice, this list of conditions and the following
 * disclaimer. 2. Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution. THIS
 * SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Java, the Duke mascot, and
 * all variants of Sun's Java "steaming coffee cup" logo are trademarks of Sun
 * Microsystems. Sun's, and James Gosling's, pioneering role in inventing and
 * promulgating (and standardizing) the Java language and environment is
 * gratefully acknowledged. The pioneering role of Dennis Ritchie and Bjarne
 * Stroustrup, of AT&T, for inventing predecessor languages C and C++ is also
 * gratefully acknowledged.
 */

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Label;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import javax.swing.JFrame;

/**
 * MouseDrag -- implement simple mouse drag in a window.
 */
public class MouseDrag extends Component implements MouseListener,
        MouseMotionListener
{
    /** The Image we are to paint */
    Image curImage;
    
    /** Kludge for showStatus */
    static Label status;
    
    /** true if we are in drag */
    boolean inDrag = false;
    
    /** starting location of a drag */
    int startX = -1, startY = -1;
    
    /** current location of a drag */
    int curX = -1, curY = -1;
    
    // "main" method
    public static void main(String[] av)
    {
        JFrame f = new JFrame("Mouse Dragger");
        Container cp = f.getContentPane();
        
        if (av.length < 1)
        {
            System.err.println("Usage: MouseDrag imagefile");
            System.exit(1);
        }
        Image im = Toolkit.getDefaultToolkit().getImage(av[0]);
        
        // create a MouseDrag object
        MouseDrag j = new MouseDrag(im);
        
        cp.setLayout(new BorderLayout());
        cp.add(BorderLayout.NORTH, new Label(
                "Hello, and welcome to the world of Java"));
        cp.add(BorderLayout.CENTER, j);
        cp.add(BorderLayout.SOUTH, status = new Label());
        status.setSize(f.getSize().width, status.getSize().height);
        f.pack();
        f.setVisible(true);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    
    // "Constructor" - creates the object
    public MouseDrag(Image i)
    {
        super();
        curImage = i;
        setSize(300, 200);
        addMouseListener(this);
        addMouseMotionListener(this);
    }
    
    public void showStatus(String s)
    {
        status.setText(s);
    }
    
    // Five methods from MouseListener:
    /** Called when the mouse has been clicked on a component. */
    public void mouseClicked(MouseEvent e)
    {
    }
    
    /** Called when the mouse enters a component. */
    public void mouseEntered(MouseEvent e)
    {
    }
    
    /** Called when the mouse exits a component. */
    public void mouseExited(MouseEvent e)
    {
    }
    
    /** Called when the mouse has been pressed. */
    public void mousePressed(MouseEvent e)
    {
        Point p = e.getPoint();
        System.err.println("mousePressed at " + p);
        startX = p.x;
        startY = p.y;
        inDrag = true;
    }
    
    /** Called when the mouse has been released. */
    public void mouseReleased(MouseEvent e)
    {
        inDrag = false;
        System.err.println("SELECTION IS " + startX + "," + startY + " to "
                + curX + "," + curY);
    }
    
    // And two methods from MouseMotionListener:
    public void mouseDragged(MouseEvent e)
    {
        Point p = e.getPoint();
        // System.err.println("mouse drag to " + p);
        showStatus("mouse Dragged to " + p);
        curX = p.x;
        curY = p.y;
        if (inDrag)
        {
            repaint();
        }
    }
    
    public void paint(Graphics g)
    {
        int w = curX - startX, h = curY - startY;
        Dimension d = getSize();
        g.drawImage(curImage, 0, 0, d.width, d.height, this);
        if (startX < 0 || startY < 0) return;
        System.err.println("paint:drawRect @[" + startX + "," + startY
                + "] size " + w + "x" + h);
        g.setColor(Color.red);
        g.fillRect(startX, startY, w, h);
    }
    
    public void mouseMoved(MouseEvent e)
    {
        showStatus("mouse Moved to " + e.getPoint());
    }
    
}
